写一个教室类,有学生/老师/网管 其中学生人数可以不同,但是开班以后,人数必须固定(数组) 老师只有一个,所有教室共享(static) 网管所有教室共享,并且不变. 要求实现代码以后,创建一个教室对象-Write a classroom class, a student/teacher/network management in which the number of students may be different, but the classes later, the